Select "Sketch" from the menu; From the drop-down menu, select the "Include Library" and "Manage Libraries" tabs respectively.
In the window that opens, type the name of the library you want to add into the search bar; Select your library and click the "Install" button.
After the installation process is completed, "File" is selected; Select the "Examples" tab from the drop-down menu. Then, you can find the name of your library from the menu that opens and benefit from sample applications.